package com.itheima.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

@Component
public class SpringSecurityUserService implements UserDetailsService {

    @Reference          //注意：通过dubbo远程调用用户服务
    private UserService userService;

    //根据用户名查询用户信息
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        //远程调用服务，根据用户名查询用户信息
        User user = userService.findByUsername(username);   //远程调用
        if (user == null){
            //用户名不存在
            return null;
        }
        List<GrantedAuthority> list = new ArrayList<>();
        //动态为当前用户授权
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            //遍历角色集合，为用户授予角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();    //得到角色所拥有的权限
            for (Permission permission : permissions) {
                //遍历权限集合，为用户授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));  //得到权限关键字
            }
        }
        //验证当前用户所用有的权限
        org.springframework.security.core.userdetails.User securityUser = new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
        return securityUser;
    }
}
